Combined hoist and rack mechanism.



H. SAWYEFL COMBINED H0981 AND- RACK MEGHANISM APPucmou man :uw 12. 191.5.

UNITED sTATEs PATENT oEEroE.

HARRY SAWYEB, OF MUSKEGON, MICHIGAN, ASSIGNOR TO SHAW ELECTRIC CRANE COMPANY, OF MUSKEGON, MICHIGAN, A CORPORATION 0F MICHIGAN. i

COMBINED HOIST AND RACK MECHANISM.

Specification of Letters Patent.

Patented Dec. 25, 1917.

Application led July 12, 1916. Serial No. 108,832.

To all whom it may concern:

Be it known that I, HARRY SAWYER, a citizen of the United States, residing at Muskegon, in the county of Muskegon, State of Michigan, have made a certain new and useful Invention in Combined Hoist and Rack Mechanism, of which the following is a specification.

This invention relates to combined hoist and rack mechanism.

The object of the invention is to provide a combined hoist and rack mechanism which is simple in structure, economical to manufacture, and eiiicient in operation.

A further object of the invention is to provide a structure of mechanism of the character referred to employing a rack'drum and a hoist drum both mounted upon. the saine shaft and operated in the same direction of rotation.

Further ohjectsof the invention will ap pear more fully hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawing, and finally pointed out in the appended claims. I,

Figure 1 is al plan view partly inY longitudinal section showing a' combined hoist and rack mechanism embodying the principles of my invention.

Fig. 2 is a reduced view in end elevation taken on the line 2, 2, Fig. 1, looking in the direction of the arrows.

The same part is designated by reference numeral wherever throughout the several views.

Referring to the drawing, 4 designates a main operating shaft pon which are mounted a rack drum 5, and a hoist drum 6, the rack drum being keyed or otherwise connected to rotate with said shaft while the hoist drum is journaled to rotate upon said shaft. A gearing for driving said shaft and the hoist drum is inclosed within the casing 7, and includes a planetary gear system comprising spur gears 2 and 3. The gear 2 is suitably connected to the hoist drum to rotate therewith. The gear 3 is connected to a spur wheel 8, to rotate withshaft 4. Disposed intermediate the spur gears 2, 3, and mounted the same 1t occurs to rotateifreely upon shaft 4 is the inter-- mediate spur gear wheel 9. A rack drum driving motor 12 is suitably gearedto spur gear wheel 8, through any desired arrangement of mtermediate gearing, such, for eX- ample, as a pinion 18, mounted on a stud 16,

and meshing with gear 8, said inion being driven by a gear wheel 15, with which is meshed a pinion 14 on the shaft of the rack motor 12. A hoist motor 13 is geared by means of inion 17, to the intermediate spur gear 9. arried by 'the intermediate spur gear 9 are a series of studs 19, which extend transverselytherethrough. Upon the respective ends of said studs are mounted pinions 20 and 21. The pinions 20 mesh with thespur gear 2, while the pinions 21 mesh with the spur gear 3. The operation is exceedingly simple. With the hoist motor 13 idle the intermediate gear 9 is held stationary. Now, by putting the rack motor 12 into operation ithe spur .gear wheel 8 is driven therefrom through the intermediate gears 14, 15, and 18. The rotation of gear 8 imparts coincident rotation to the shaft 4, and with it the rack drum 5. At the Ysame time spur gear 3 is rotated with spur gear wheel 8. Through the intermeshing of spur gear 3, with pinion 21, the pinion 20, is also driven, thereby driving the spur gear 2, and with it the hoist drum 6, and in the same direction with the rack drum. When, however, the rack motor is idle, gear 8, and consequently also gear 3, will be held stationary. Now, by putting the hoist motor into operation the intermediate gear 9 is driven from vsmaller diameter than gear 2, and that-pinion 21 is of correspondingly larger diameter than pinion 20. By reason of a relative variation in the diameters of gears 2 and 3, and of correspondingly relative variation in the diameters of pinions 20 and 21, the desired gear ratio is secured. If gears 2 and '3 were-of the'same diameter and gears 20,

and'21, were of the, same diameter, then, 1n racking, the two drums would run at the same number of revolutions per minute and consequentlyv would have to be of the same diameter to run at the same peripheral speed. In this case, however, there would be no hoisting or lowering as the pinions 20, 21, would simply roll around gears 2 and 3, without causing any relative motion between them. If, however, the diameter of gear 3 differed from that of gear 2, as, for

example, if the diameter of gear 3 is slightly smaller than that of gear 2, and pinion 20 slightly smaller than pinion 21, the tooth speed of pinion 2O would be correspondingly less than that of pinion 21, and hence the gear 2, would be driven at a speed corresponding to the difference of tooth speeds of the pinions 20 and 21. If the reverse of this diameter relation were employed then the gear 2 v uld be driven in reverse direction at a speed corresponding to the difference .in tooth speeds of the pinions 20, 21.

The arrangement above described imparts rotation in the same direction to both the hoist drum and also the rack drum, while at the same time a desirable gear ratio intermediate the hoist motor and hoist drum is secured in the planetary gear system.

Many variations and changes in the details of structure and arrangement of parts will readily occur to persons skilled in the art and still fall within the spirit and scope of my invention. While, therefore, I have shown and described one specific embodiment of my invention, I do not desire to be limited or restricted to the eXact details shown, but what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is,-

1. In a combined hoist and rack mechanism, a main operating shaft, a rack drum mounted thereon to rotate therewith, a hoist drum also mounted on said shaft to rotate thereon, means to rotate said hoist drum and shaft simultaneously in the same direction, said hoist drum being located between the rack drum and the said rotating means, and means to rotate said hoist drum independently.

In a combined hoistA and rack mechanism, a main operating shaft, a. rack drum the latter, and gearing also actuatedalso mounted on said shaft to rotate thereon, spur gears respectively connected to said shaft and hoist drum, a rack motor vfor driving one of said gears, planetary gear pinions respectively meshing with said spur gears, au intermediate gear wheel carrying said pinions, said hoist drum being located between the rack drum and the said gearing, and a hoist motor geared to said intermediate gear wheel.

4. In a combined hoist and rack mechanism, a rack motor and a hoist motor, a main operating shaft, a rack drum and a hoist drum mounted on said shaft, said rack drum being connected to rotate with said shaft, and said hoist drum mounted to rotate upon said shaft in combination with a spur gear driven by the rack motor and connected to rotate with said shaft, a spur gear connected to rotate with said hoist drum, connected pinions respectively meshing with said spur gears, a carrier for said-pinions and a hoist motor geared to said carrier.

'5. In a combined hoist and rack mechanism, a main operating shaft, a rack drum mounted thereon to rotate therewith, a hoist drum also mounted upon said shaft to rotate thereon, a carrier mounted on 'said shaft to rotate freely thereon, connected pinions carried by said carrier, spur gears respectively meshing with said pinions, one of said spur gears connected to rotate with the hoist drum and the other connected to rotate with said shaft, a rack motor geared to the shaft to drive the same and a hoist motor geared to drive said carrier.

6. In a combined hoist and rack mechanism, a hoist drum and a rack drum, gears respectively connected to said drums, pinions conneoted to move in unison and respectively geared to said gears, and means to drive one of said gears.

7. In a combined hoist and rack mechanism, a hoist drum'and a rack drum, gears respectively connected to said drums, pinions connected to move, in unison and respectively geared to said gears, means to drive one of said gears, and independent means to move said pinions.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses, on this 29th day of June A. D., 1916.

- HARRY SAWYER. Witnesses:

P. J. KNnwms,

T. C. Alun. 

